Non-chattering brake-hanger.



A. E. ZIMMER.

N ON-CHATTERING BRAKE HANGER.

APPLICATION FILED MAB. e, 190e.

' 910,160. Patented Ja11.19, 1909.

AVA fis cora UNrrEn srATEs PATENT opinion `.ALBEn'i E. ZnMEn; OE BUTLER, PENNsYLvANlA, AssleNoR ro COMPANY, OF rl'rrssuno, PENNSYLVANIA, A CORPORATION NoN-CHATTERNG BEAU-HANGER 'resident of Butler, in the ycounty of Butler and State of Pennsylvania, have invented a new and useful improvement in Non-Chattering Brake-Hangers; and -I do hereby deexact description thereof. v

olarethe following to be a full, clear, and

.This invention relates to brake 'hangers for car trucks.

The object of the invention is to provide a hanger so connectedy to the supporting bracket and the brake shoe or brake rigging-as to prevent the chattering noise which isroten produced when Athe brakes are app 1e A further object is to provide such aV hanger with means for lautematically taking up wear at the points where the hangers contact with the bracket and brake shoe.

A further object is to provide connections between the hangers and brackets and shoes which permit lateralrnovement of the brake shoes without unduly straining or wearing the contacting parts.

r1`hese several objects are attained by the construction and arran ement of parts hereinafgter described and c aimed.

In the accompanying drawings ,Figure l isa view partly in elevation and partly in transverse `section showing the supporting' bracket, the hangers and the brake shoe head; Fi 2 is a view in side elevati'on showin t e same parts.

The anger supporting bracket is shown at l, the brake shoe head at 2, and the hangers at 3. Two such hangers are shown for the purpose of balancing the brake shoe. The latter may be used with or without a brake beam. When a brake beam is em ployed, one hanger at each end of the beam, or at each brake shoe head suflices.

The bracket at its upper end is provided with oppositely disposed trunnions4 projecting into openings or sockets 5 in the upper ends of the hangers. A hole extends transf, versely through the bracket and its trunnions 4, and extending through this hole and through the openings in the hangers is a bolt 6 provided at one end with a head 7 and at its opposite end with a nut 8, or its equivalent. Between the nut and one of the hangers is a spring 9 tending constantly to press the hangers against the trunnions on the Y,

lSpecification. of Letters Patent.

Application lad March 6, 1908. Serial No. 419,608. n

PE a

Pa aaa Jaa 19 reofg.

A washer provide bracket. the inner end of said spring.; -f

lThe outer faces ofithe trunmo'ns ,4a1 -theinner facesof the,socketsfiaefOtispecial shape, being formed,infwplazll 5 Parallel tOi and lying in the axis of the trunnionSa on parabolic curves, indicated-natali'. :,Tilie .spring 9 holds these parabolica-faces@constantly in contact so that the haai'verscannotchatter when the brakes are afpp -'ed,-zd1`1e ftthedact that there is no lost motionbetween ,thehangf ers and bracket. The parabolicpcurvesa however, permit the hangersxto; swingssidewise vwithout binding or creat-ing nuduezfweai'on Athe contacting faces, -suchelaterah movement being necessary to permit;thefbrakershoeto fit against the tread ofthe wheelfinlall positions ofthe latter, it beingwell known that wheels and axles 'have Asome'n fiovemeht, vtrans-` ver-selyl of the track orftrucksrralnezt.-

Obviously the arrangement shown in the drawings might be reversed. For instance, the t'runnins 4 might be formed on the hangers and the sockets 5 in the bracket, and also the spring 9 might be placed on the other end of the bolt 6 that is, between the head 7, and one of the hangers. The connections above described are also provided between the brake shoe and hangers, as shown, the brake shoe having trunnions 4 similar to the trunnions on the bracket and the hangers having at their lower ends sockets 5 similar to the sockets in their upper ends.

i The construction `described provides a brake hanger which is absolutely non-chattering, duc to thefact that the parabolic surfaces are always in contact, one in which the wear between said surfaces is automatically taken up by the spring 9, and one which permits lateral movement of the hangers and brake shoes without excessive friction or wear. The parabolic surfaces have largely the same eiect as a ball and ysocket connection in providing for transverse movement as well as the usual swinging movement, but have the advantage of being more tapering so that they prevent chattering, which would not be eii'ected by the flatter curve of a ball and socket connection.

What I claim is:

1.- In a brake hanger, the combination of a hanger, and a coperatin member to which said hanger is connecte said hanger and member being provided, thel one with a socket andthe other with a trunnion. fitting into said socket, said socket and trunnion having their contacting faces, in planes parallel to' and lying in the axis of the trunnion, formed on-parabolic curves.

2. In a brake hanger, the combination of a hanger and a coperatin member to which s aid hanger is connecte ,t said hanger and member being provided, the one with a socket and the other with a trunnion fitting 'into said socket, said socket. and trunnion having their contacting'faces, in planesparallel to and lying in the axis of the trunnion, formed on parabolic curves, and means exerting. a constant'pressure holding said surfaces in contact.

3. In a brake hanger, the combination' of a hanger, a member to which said hanger is connected, said hanger and member being provided the one with a socket and the other with a trunnion fitting in said socket, said socket and trunnion having their contacting surfaces, in planes parallel to and lying in the axis of the trunn1on,formed on parabolic curves, a bolt extending axially' throughsaid trunnion and the han er, and a spring acting to exert pressure holding the surfaces of said trunnion and socket in contact.

4. In a brake hanger, the combination of a pair of hangers, and a member between said hangers and connected thereto, said member and hangers being provided with 'op ositely disposed sockets and oppositely 'sposed trunnions seating in said sockets, said trunnions and sockets. having their contacting surfaces, in lanes parallel to and lying in the axis of't e .trunnions, formed on parabolic curves.

5. In a brakehanger, the combination of a pair of hangers, a member between said hangers and to which they 'are connected, said hangers and members being provided, the one with sockets` and the other with trunnions tting in said sockets, said trunnions and sockets having their contacting surfaces, in planes parallel to andlying in the axis of the trunnions, formed on parabolic curves, abolt extending axially through the sockets and trunnions, and a spring interposed between a nut on the Ibolt and one of said hangers andexerting pressure holding the surfaces of the trunnions and sockets vin contact.

In testimony. whereof, I the salud ALBERT E. ZIMMER, have hereunto sct my hand.

ALBERT E. ZIMMER. 

